1125221151 has 4 divisors (see below), whose sum is σ = 1500294872. Its totient is φ = 750147432.

The previous prime is 1125221113. The next prime is 1125221161. The reversal of 1125221151 is 1511225211.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1125221151 - 2⁶ = 1125221087 is a prime.

It is a super-2 number, since 2×1125221151² = 2532245277315529602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125221101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187536856 + ... + 187536861.

It is an arithmetic number, because the mean of its divisors is an integer number (375073718).

Almost surely, 2^1125221151 is an apocalyptic number.

1125221151 is a deficient number, since it is larger than the sum of its proper divisors (375073721).

1125221151 is an equidigital number, since it uses as much as digits as its factorization.

1125221151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375073720.

The product of its digits is 200, while the sum is 21.

The square root of 1125221151 is about 33544.3162249583. The cubic root of 1125221151 is about 1040.1100570782.

Adding to 1125221151 its reverse (1511225211), we get a palindrome (2636446362).

The spelling of 1125221151 in words is "one billion, one hundred twenty-five million, two hundred twenty-one thousand, one hundred fifty-one".